A battery current control method and system

Abstract

This invention relates to a battery current control method and system, particularly in the field of automotive battery technology. The method includes: Step S1, real-time acquisition of the voltage, current, and temperature of a lithium-ion power battery; Step S2, calculation of the current boundary based on the voltage boundary of the lithium-ion power battery, and division of the current region into three regions: Region 1, Region 2, and Region 3; Step S3, region determination of the acquired current of the lithium-ion power battery, and control of the maximum charging current and maximum discharging current of the lithium-ion power battery based on the determination result; Step S4, correction of the maximum charging current and maximum discharging current of the lithium-ion power battery by setting a temperature influence coefficient based on the acquired temperature of the lithium-ion power battery. This invention effectively improves the safety and efficiency of battery use by precisely controlling the maximum charging and discharging current.

Description

Technical Field

[0001] This invention relates to the field of automotive battery technology, and in particular to a battery current control method and system. Background Technology

[0002] In actual use, the voltage and temperature of the power battery of an electric vehicle change with the magnitude and duration of the charging and discharging current. If the use of the battery is not managed and controlled, the battery voltage may exceed the safe range or the temperature may exceed the battery's operating temperature range, which may cause serious safety problems or even fire and explosion, thereby threatening the lives and property of passengers.

[0003] Current industry strategies for battery usage primarily rely on power matrix lookup tables for different battery durations or dynamic power adjustment strategies. The problem with existing technologies is that, in actual use, the actual operating conditions of the vehicle differ significantly from the fixed duration of the power matrix. This leads to the battery's power capacity not being fully utilized, or the actual operating conditions exceeding the battery's power capacity, causing battery malfunctions.

[0004] Chinese Patent Publication No. CN110293879A discloses a method for dynamically adjusting the SOP (State of Operation) of a battery. This method calculates the actual power of the battery by calling the battery electrical parameters in real time and comparing them with the allowable power of the battery. The battery power state is adjusted according to the charging and discharging time. However, when the vehicle state changes rapidly, the power calculation of the battery in this method has a delay, resulting in a lag with the real-time state of the battery and failing to effectively protect the battery. Furthermore, this method does not consider the influence of temperature. Summary of the Invention

[0005] Therefore, the present invention provides a battery current control method and system to overcome the problems of low battery safety and low efficiency caused by the inability to accurately control the charging and discharging current limits of the battery in the prior art.

[0006] To achieve the above objectives, in one aspect, the present invention provides a battery current control method, comprising:

[0007] Step S1: Real-time acquisition of voltage, current and temperature of lithium-ion power battery;

[0008] Step S2: Calculate the current boundary based on the voltage boundary of the lithium-ion power battery, and divide the current region according to the current boundary to form three current regions, namely Region 1, Region 2 and Region 3.

[0009] Step S3: Determine the region of the current collected by the lithium-ion power battery, and control the maximum charging current and maximum discharging current of the lithium-ion power battery according to the determination result.

[0010] Step S4: Based on the collected temperature of the lithium-ion power battery, set a temperature influence coefficient to correct the maximum charging current and maximum discharging current of the lithium-ion power battery.

[0011] Further, in step S2, when calculating the current boundary, the charging and discharging cutoff voltage of the lithium-ion power battery is used as the voltage boundary. The voltage boundary is converted into a current boundary using the voltage, DC internal resistance, and current of the lithium-ion power battery. The maximum charging and discharging current is calculated based on the real-time operating voltage, charging and discharging cutoff voltage, and DC internal resistance.

[0012]

[0013] In the formula, This represents the maximum discharge current, which is a negative value. U represents the maximum charging current, which is a positive value. min U is the discharge cutoff voltage. max U is the charging cutoff voltage. cell R is the terminal voltage of a single unit. eq This is the DC internal resistance.

[0014] Furthermore, when dividing the current region, the current region where the current is less than the maximum continuous charging current or the actual battery current is less than the maximum continuous discharging current is defined as Region 1, that is, or In the formula, I(t) is the current collected from the lithium-ion power battery. For the maximum continuous charging current, This is the maximum continuous discharge current;

[0015] Region two is defined as the current region where the current is greater than or equal to the maximum continuous discharge current and less than the maximum pulse discharge current. In the formula, This is the maximum pulse discharge current. This is the maximum continuous discharge current;

[0016] Region three is defined as the current region where the current is greater than or equal to the maximum continuous charging current and less than the maximum pulse charging current. In the formula, This is the maximum pulse charging current.

[0017] Furthermore, in step S3, if the current of the lithium-ion power battery collected is within region one, the upper limit of the maximum charging current is controlled to be the first current, and the maximum discharging current is controlled to be the second current.

[0018] If the current of the lithium-ion power battery collected is within region two, the upper limit of the maximum charging current is controlled to the third current, and the maximum discharging current is controlled to the fourth current.

[0019] If the current of the lithium-ion power battery collected is within region three, the upper limit of the maximum charging current is controlled to the fifth current, and the maximum discharging current is controlled to the sixth current.

[0020] Furthermore, when the current of the lithium-ion power battery is collected within region two or region three, timing begins to record the duration of the current. The upper limit of the charging and discharging current is dynamically adjusted according to the duration of the current, and the pulse duration coefficient is defined as α. t ,set up, Δt pulse Define the time for the pulse.

[0021] Furthermore, when the collected current of the lithium-ion power battery is within region one, the first current is taken as the maximum charging current of the lithium-ion power battery, and the second current is taken as the maximum discharging current of the lithium-ion power battery. The calculation methods for the first and second currents are as follows, where...

[0022]

[0023] Furthermore, when the collected current of the lithium-ion power battery is within region two, the third current is taken as the maximum charging current of the lithium-ion power battery, and the fourth current is taken as the maximum discharging current of the lithium-ion power battery. The calculation methods for the third and fourth currents are as follows, where...

[0024]

[0025] Furthermore, when the collected current of the lithium-ion power battery is within region three, the fifth current is taken as the maximum charging current of the lithium-ion power battery, and the sixth current is taken as the maximum discharging current of the lithium-ion power battery. The calculation methods for the fifth and sixth currents are as follows, where...

[0026]

[0027] Furthermore, in step S4, a temperature influence coefficient α is set during the correction process. T ,set up,

[0028]

[0029] The corrected maximum charging current is I max The corrected maximum discharge current is I. min ,set up,

[0030]

[0031] Among them, when the actual temperature T of the lithium-ion power battery is within the optimal operating temperature Tnom, α T=1, no correction is made for the charging and discharging current; when the actual temperature T of the lithium-ion power battery exceeds the optimal operating temperature Tnom, the temperature influence coefficient α is used. T The charging and discharging current is corrected; when the actual temperature of the lithium-ion power battery exceeds the battery's maximum allowable operating temperature Tmax, α is set. T =0, battery charging and discharging are prohibited.

[0032] On the other hand, the present invention also provides a battery current control system, comprising:

[0033] The data acquisition module is used to collect the voltage, current, and temperature of the lithium-ion power battery in real time.

[0034] The partitioning calculation module is used to calculate the current boundary based on the voltage boundary of the lithium-ion power battery, and to divide the current region according to the current boundary.

[0035] The control module is used to determine the region of the current collected by the lithium-ion power battery, and control the maximum charging current and maximum discharging current of the lithium-ion power battery according to the determination result.

[0036] The calibration module is used to correct the maximum charging current and maximum discharging current of the lithium-ion power battery by setting a temperature influence coefficient based on the collected temperature of the lithium-ion power battery.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention uses the real-time voltage and charge / discharge cutoff voltage of the battery as references for adjusting the charge / discharge current, and distinguishes between peak charge / discharge and continuous charge / discharge by the duration of charge / discharge, adjusting the allowable charge / discharge current of the battery in different regions to keep the battery voltage within a reasonable range. The present invention accurately provides a method for dividing the regions corresponding to different charge / discharge durations and a method for calculating the current, and introduces a temperature influence factor to limit the charge / discharge of the battery with current. The present invention provides a method for calculating the charge / discharge current in real time in different current ranges, which allows the charge / discharge current to be adjusted in real time, and uses the charge / discharge cutoff voltage as a protection threshold, which is conducive to maximizing the battery's performance.

[0038] In particular, this invention divides the current region by calculating the current boundary, thereby obtaining different current regions. This allows for comparison of the real-time acquired battery current with each current region to determine the current region in which the real-time acquired battery current is located. Based on the current region in which the real-time acquired current is located, different methods are adopted to control the maximum charging and discharging current of the battery, thereby ensuring battery safety and improving battery efficiency. Furthermore, when the real-time acquired battery current is in different current regions, different calculation methods are used for different regions to accurately control the maximum charging and discharging current of the battery. At the same time, a temperature influence coefficient is set based on the real-time acquired battery temperature to correct the maximum charging and discharging current of the battery. This correction further improves the accuracy of controlling the maximum charging and discharging current of the battery, reducing the impact of high temperature on battery charging and discharging, thereby further improving battery safety and battery efficiency.

[0039] In particular, when calibrating the maximum charge and discharge current of a lithium-ion power battery, this invention compares the real-time collected battery temperature with various threshold values ​​to precisely set the value of the temperature influence coefficient, thereby ensuring the accuracy of the calibration. If the real-time collected battery temperature is within the optimal operating temperature, no calibration is performed. If the real-time collected battery temperature is greater than the optimal operating temperature, the temperature influence coefficient is calculated based on the actual temperature to ensure the accuracy of the temperature influence coefficient. If the real-time collected battery temperature exceeds the battery's maximum allowable operating temperature, the temperature influence coefficient is set to 0, and charging and discharging are stopped, thereby reducing the impact of high temperature on battery charging and discharging and ensuring battery safety. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating the battery current control method in this embodiment;

[0041] Figure 2 This is a schematic diagram of the voltage boundary of the lithium-ion power battery in this embodiment;

[0042] Figure 3 This is a schematic diagram of the current region in this embodiment;

[0043] Figure 4 This is a schematic diagram of the battery current control system in this embodiment. Detailed Implementation

[0044] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0045] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0046] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Please see Figure 1 As shown, this is the battery current control method of this embodiment, the method including:

[0048] Step S1: Real-time acquisition of voltage, current and temperature of lithium-ion power battery;

[0049] Step S2: Calculate the current boundary based on the voltage boundary of the lithium-ion power battery, and divide the current region according to the current boundary to form three current regions, namely Region 1, Region 2 and Region 3.

[0050] Step S3: Determine the region of the current collected by the lithium-ion power battery, and control the maximum charging current and maximum discharging current of the lithium-ion power battery according to the determination result.

[0051] Step S4: Based on the collected temperature of the lithium-ion power battery, set a temperature influence coefficient to correct the maximum charging current and maximum discharging current of the lithium-ion power battery.

[0052] Specifically, this embodiment divides the current region by calculating the current boundary, thereby obtaining different current regions. This allows for comparison of the real-time acquired battery current with each current region to determine the current region in which the real-time acquired battery current is located. Based on the current region in which the real-time acquired current is located, different methods are adopted to control the maximum charging and discharging current of the battery, thereby ensuring battery safety and improving battery efficiency. Furthermore, when the real-time acquired battery current is in different current regions, different calculation methods are used for different regions to accurately control the maximum charging and discharging current of the battery. At the same time, a temperature influence coefficient is set based on the real-time acquired battery temperature to correct the maximum charging current and maximum discharging current of the battery. This correction further improves the accuracy of controlling the maximum charging and discharging current of the battery, reduces the impact of high temperature on battery charging and discharging, and further improves battery safety and battery efficiency.

[0053] Please see Figure 2 As shown, in step S2, when calculating the current boundary, the charging and discharging cutoff voltage of the lithium-ion power battery is used as the voltage boundary. The voltage boundary is converted into a current boundary using the voltage, DC internal resistance, and current of the lithium-ion power battery. The maximum charging and discharging current is calculated based on the real-time operating voltage, charging and discharging cutoff voltage, and DC internal resistance.

[0054]

[0055] In the formula, This represents the maximum discharge current, which is a negative value. U represents the maximum charging current, which is a positive value. min U is the discharge cutoff voltage. max U is the charging cutoff voltage. cell R is the terminal voltage of a single unit. eq The DC internal resistance is used. In this embodiment, when the voltage of the lithium-ion power battery reaches the cutoff voltage, the current is 0. and These refer to the maximum discharge / charge current that a single cell can withstand at a given moment. This current is calculated based on the battery terminal voltage and DC internal resistance at the current moment.

[0056] Specifically, in step S2, when dividing the current region, the division is based on the maximum pulse charging / discharging current and the maximum continuous charging / discharging current. The pulse time of the maximum pulse charging / discharging current needs to be defined. In this embodiment, the pulse time of the pulse charging / discharging current is defined as Δt. pulse The pulse duration of the pulse charging and discharging current is set to 10 seconds. The pulse duration of the pulse charging and discharging circuit can be any value greater than zero. The pulse duration of the pulse charging and discharging circuit is not a limitation of the embodiment of the present invention and can be specifically determined according to the battery characteristics.

[0057] Please see Figure 3 As shown, when dividing the current region, the current region where the current is less than the maximum continuous charging current or the actual battery current is less than the maximum continuous discharging current is defined as Region 1, i.e. or In the formula, I(t) is the current collected from the lithium-ion power battery. For the maximum continuous charging current, This is the maximum continuous discharge current;

[0058] Region two is defined as the current region where the current is greater than or equal to the maximum continuous discharge current and less than the maximum pulse discharge current. In the formula, This is the maximum pulse discharge current. This is the maximum continuous discharge current;

[0059] Region three is defined as the current region where the current is greater than or equal to the maximum continuous charging current and less than the maximum pulse charging current. In the formula, This is the maximum pulse charging current.

[0060] Specifically, in step S3, if the current of the lithium-ion power battery collected is within region one, the upper limit of the maximum charging current is controlled to be the first current, and the maximum discharging current is controlled to be the second current.

[0061] If the current of the lithium-ion power battery collected is within region two, the upper limit of the maximum charging current is controlled to the third current, and the maximum discharging current is controlled to the fourth current.

[0062] If the current of the lithium-ion power battery collected is within region three, the upper limit of the maximum charging current is controlled to the fifth current, and the maximum discharging current is controlled to the sixth current.

[0063] Specifically, timing begins when the current collected from the lithium-ion power battery is within region two or region three to record the duration of the current. The upper limit of the charging and discharging current is dynamically adjusted according to the duration of the current, and the pulse duration coefficient is defined as α. t ,set up, Δt pulse The pulse duration can be defined as 10 seconds. In this embodiment, the upper limit of the charging and discharging current is dynamically adjusted according to the current duration, determined by the fourth and fifth currents. At that time, the upper limit of the current is when At that time, as the duration of the current increases, the upper limit of the current increases towards... near, This is the continuous charging current.

[0064] Specifically, when the current collected from the lithium-ion power battery is within region one, the first current is taken as the maximum charging current of the lithium-ion power battery, and the second current is taken as the maximum discharging current of the lithium-ion power battery. The charging current is a positive value, and the discharging current is a negative value. The calculation methods for the first and second currents are as follows, where...

[0065]

[0066] In the formula, The maximum charging current is calculated based on the cutoff voltage and internal resistance.

[0067] The maximum discharge current is calculated based on the cutoff voltage and internal resistance.

[0068] Specifically, when the current collected from the lithium-ion power battery is within region two, the third current is taken as the maximum charging current of the lithium-ion power battery, and the fourth current is taken as the maximum discharging current of the lithium-ion power battery. The calculation methods for the third and fourth currents are as follows, where...

[0069]

[0070] Specifically, when the current collected from the lithium-ion power battery is within region three, the fifth current is taken as the maximum charging current of the lithium-ion power battery, and the sixth current is taken as the maximum discharging current of the lithium-ion power battery. The calculation methods for the fifth and sixth currents are as follows, where...

[0071]

[0072] Specifically, in step S4 of this embodiment, a temperature influence coefficient α is set during the correction process. T ,set up,

[0073]

[0074] The corrected maximum charging current is I max The corrected maximum discharge current is I. min ,set up,

[0075]

[0076] Among them, when the actual temperature T of the lithium-ion power battery is within the optimal operating temperature Tnom, α T =1, no correction is made for the charging and discharging current; when the actual temperature T of the lithium-ion power battery exceeds the optimal operating temperature Tnom, the temperature influence coefficient α is used. T The charging and discharging current is corrected; when the actual temperature of the lithium-ion power battery exceeds the battery's maximum allowable operating temperature Tmax, α is set. T =0, battery charging and discharging are prohibited.

[0077] Specifically, in this embodiment, when calibrating the maximum charge and discharge current of a lithium-ion power battery, the temperature influence coefficient is precisely set by comparing the real-time collected battery temperature with various threshold values, thereby ensuring the accuracy of the calibration. If the real-time collected battery temperature is within the optimal operating temperature, no calibration is performed. If the real-time collected battery temperature is greater than the optimal operating temperature, the temperature influence coefficient is calculated based on the actual temperature to ensure the accuracy of the temperature influence coefficient. If the real-time collected battery temperature exceeds the maximum allowable operating temperature of the battery, the temperature influence coefficient is set to 0, and charging and discharging are stopped, thereby reducing the impact of high temperature on battery charging and discharging and ensuring the safety of battery use.

[0078] Specifically, this invention uses the battery's real-time voltage and charge / discharge cutoff voltage as references for adjusting the charge / discharge current. It distinguishes between peak charge / discharge and continuous charge / discharge based on the duration of charge / discharge, and adjusts the allowable charge / discharge current of the battery in different regions to keep the battery voltage within a reasonable range. This invention provides a precise method for dividing regions corresponding to different charge / discharge durations and a current calculation method, and introduces a temperature influence factor to limit battery charge / discharge with current. This invention provides a method for real-time calculation of charge / discharge current in different current ranges, which allows for real-time adjustment of the charge / discharge current. Using the charge / discharge cutoff voltage as a protection threshold is beneficial for maximizing battery performance.

[0079] Specifically, the embodiments of the present invention constrain the battery charging and discharging current by setting the battery charging and discharging cutoff voltage. The charging and discharging current includes continuous current and peak current, and a temperature correction coefficient is introduced to ensure that the battery does not overheat, thereby achieving control of the battery's operating current. In actual use, power batteries have different operating boundaries, including voltage, continuous current, pulse current, temperature, etc. These boundaries together determine the upper and lower limits of the battery's allowable operating range to ensure that the battery is in the best working state and does not cause safety problems.

[0080] Please see Figure 4 As shown, this is the battery current control system of this embodiment, which includes,

[0081] The data acquisition module is used to collect the voltage, current, and temperature of the lithium-ion power battery in real time.

[0082] The partitioning calculation module is used to calculate the current boundary based on the voltage boundary of the lithium-ion power battery, and to divide the current region according to the current boundary.

[0083] The control module is used to determine the region of the current collected by the lithium-ion power battery, and control the maximum charging current and maximum discharging current of the lithium-ion power battery according to the determination result.

[0084] The calibration module is used to correct the maximum charging current and maximum discharging current of the lithium-ion power battery by setting a temperature influence coefficient based on the collected temperature of the lithium-ion power battery.

[0085] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A battery current control method characterized by, include: Step S1: Real-time acquisition of voltage, current and temperature of lithium-ion power battery; Step S2: Calculate the current boundary based on the voltage boundary of the lithium-ion power battery, and divide the current region according to the current boundary to form three current regions, namely Region 1, Region 2 and Region 3. In step S2, when calculating the current boundary, the charging and discharging cutoff voltage of the lithium-ion power battery is used as the voltage boundary. The voltage boundary is converted into a current boundary using the voltage, DC internal resistance, and current of the lithium-ion power battery. The maximum charging and discharging current is calculated based on the real-time operating voltage, charging and discharging cutoff voltage, and DC internal resistance. In the formula, This represents the maximum discharge current, which is a negative value. U represents the maximum charging current, which is a positive value. min U is the discharge cutoff voltage. max U is the charging cutoff voltage. cell R is the terminal voltage of a single unit. eq DC internal resistance; When dividing the current region, the current region where the current is less than the maximum continuous charging current or the actual battery current is less than the maximum continuous discharging current is defined as Region 1, i.e. or In the formula, I(t) is the current collected from the lithium-ion power battery. For the maximum continuous charging current, This is the maximum continuous discharge current; Region two is defined as the current region where the current is greater than or equal to the maximum continuous discharge current and less than the maximum pulse discharge current. In the formula, This is the maximum pulse discharge current. This is the maximum continuous discharge current; Region three is defined as the current region where the current is greater than or equal to the maximum continuous charging current and less than the maximum pulse charging current. In the formula, This is the maximum pulse charging current; Step S3: Determine the region of the current collected by the lithium-ion power battery, and control the maximum charging current and maximum discharging current of the lithium-ion power battery according to the determination result. Step S4: Based on the collected temperature of the lithium-ion power battery, set a temperature influence coefficient to correct the maximum charging current and maximum discharging current of the lithium-ion power battery.

2. The battery current control method according to claim 1, characterized in that, In step S3, when the current of the lithium-ion power battery is within region two or region three, timing begins to record the duration of the current. The upper limit of the charging and discharging current is dynamically adjusted according to the duration of the current, and the pulse duration coefficient is defined as α. t ,set up, Δt pulse Define the time for the pulse.

3. The battery current control method according to claim 2, characterized in that, When the current collected from the lithium-ion battery is within region one, the first current is taken as the maximum charging current of the lithium-ion battery, and the second current is taken as the maximum discharging current of the lithium-ion battery. The calculation methods for the first and second currents are as follows, where...

4. The battery current control method according to claim 3, characterized in that, When the current collected from the lithium-ion battery falls within region two, the third current is taken as the maximum charging current of the lithium-ion battery, and the fourth current is taken as the maximum discharging current of the lithium-ion battery. The calculation methods for the third and fourth currents are as follows, where...

5. The battery current control method according to claim 4, characterized in that, When the current collected from the lithium-ion power battery is within region three, the fifth current is taken as the maximum charging current of the lithium-ion power battery, and the sixth current is taken as the maximum discharging current of the lithium-ion power battery. The calculation methods for the fifth and sixth currents are as follows, where...

6. The battery current control method according to claim 5, characterized in that, If the current of the lithium-ion power battery collected is within region one, the upper limit of the maximum charging current is controlled as the first current, and the maximum discharging current is controlled as the second current. If the current of the lithium-ion power battery collected is within region two, the upper limit of the maximum charging current is controlled to the third current, and the maximum discharging current is controlled to the fourth current. If the current of the lithium-ion power battery collected is within region three, the upper limit of the maximum charging current is controlled to the fifth current, and the maximum discharging current is controlled to the sixth current.

7. The battery current control method according to claim 6, characterized in that, In the step S4, when the correction is performed, the temperature influence coefficient a is provided T , provided, The corrected maximum charge current is I max , the corrected maximum discharge current is I min , set, wherein, when the actual temperature T of the lithium-ion power battery collected is within the optimal working temperature Tnom, a T = 1, no correction is made to the charge and discharge current; when the actual temperature T of the lithium-ion power battery exceeds the optimal working temperature Tnom, the charge and discharge current is corrected according to the temperature influence coefficient a T ; when the actual temperature of the lithium-ion power battery exceeds the maximum allowable working temperature Tmax of the battery, a T = 0, the battery charge and discharge is prohibited.

8. A system applied to the battery current control method as described in any one of claims 1-7, characterized in that, include: The data acquisition module is used to collect the voltage, current, and temperature of the lithium-ion power battery in real time. The partitioning calculation module is used to calculate the current boundary based on the voltage boundary of the lithium-ion power battery, and to divide the current region according to the current boundary. The control module is used to determine the region of the current collected by the lithium-ion power battery, and control the maximum charging current and maximum discharging current of the lithium-ion power battery according to the determination result. The calibration module is used to correct the maximum charging current and maximum discharging current of the lithium-ion power battery by setting a temperature influence coefficient based on the collected temperature of the lithium-ion power battery.

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